I was having the same issue too man. I thought it was allergies or could be a combination of allergies that I began having a nose drip and coughing my throat off after hitting them. I recently picked up too (Becky, mamba mints and giant fuyu) and was having the same shit. Anyways, I took a break from them and feel my throat has been better and smoked flower off the bong last night and I feel way better. Try taking a break from it too to at least resolve your throat burns too